you are a smart criminal and Aparna is kind of a police officer who'd do anything to catch the criminals, you mastered the art of not leaving traces and Even if by mistake you leave some external part of yours at the crime scene like a hair or nails your DNA can't be traced, the only way to get your DNA is getting it from inside, like your blood, saliva, sperm, officer Aparna traps you to get your external samples and the easiest way is sperm